// 代码索引 4-1-1-1
#include <iostream>
#include <Eigen/Dense>

int main()
{
    Eigen::Matrix3f A;
    Eigen::Vector3f b;
    A << 1, 2, 3,
         4, 5, 6,
         7, 8, 10;
    b << 3, 3, 4;
    std::cout << "Here is the matrix A:\n" << A << std::endl;
    std::cout << "Here is the vector b:\n" << b << std::endl;
    Eigen::Vector3f x = A.colPivHouseholderQr().solve(b);
    std::cout << "The solution is:\n" << x << std::endl;
}